Cannot add jars to new Docker image using gradle-docker-plugin

As @nlloyd's comment, the key to the problem was my Dockerfile setting.

The following is the key part in my Gradle script with the problem.

...docker {    name "${project.group}/${jar.baseName}"    files jar.archivePath    buildArgs(['JAR_FILE': "${jar.archiveName}"])}bootJar {    baseName = 'gs-spring-boot-docker'    version =  '0.1.0'}...

It creates the jar file as follows:

.../build/libs/gs-spring-boot-docker-0.1.0.jar

and the following is the Dockerfile:

FROM openjdk:8-jdk-alpineVOLUME /tmpARG JAR_FILEADD ${JAR_FILE} app.jarENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

It takes an argument, 'JAR_FILE' that is supposed to be the full path of the jar file to be included in the new Docker image to be built and the specific value of JAR_FILE is specified by the docker task in the Gradle script through '${jar.archiveName}'.

The following is the error message I got during docker task.

ADD failed: stat /var/lib/docker/tmp/docker-builder498743832/gs-spring-boot-docker.jar: no such file or directory

It attempts to add '.../gs-spring-boot-docker.jar', but the actual name of the jar file is 'gs-spring-boot-docker-0.1.0.jar', followed by the version signature.

so I've removed the 'version' in bootJar in the Gradle script:

bootJar {    baseName = 'gs-spring-boot-docker'}

Then it creates a jar file with the correct name, 'gs-spring-boot-docker.jar' and the build process is successfully completed.

I don't know yet there is a better way of doing this, but the problem is done.